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Test Concerning Proportions
1. Twenty one out of 100 randomly selected women said they use seat belts, while 117 out of 180 men said the same. Test the claim that men are more safety conscious than women based one the use of seat belts at a 0.01 level of significance. Construct a 99% confidence interval to test the claim.
2. Labor statistics indicate that 88 out of 100 cashiers and servers are women. A random sample of cashiers and servers in a large city indicate that 124 of 150 cashiers and 200 of 250 servers are women. Is there a significant difference in the proportion of servers and proportion of cashiers who are women at 0.05 level of significance?
an avalanche is a major danger facing skiers snowboarders and snowmobilers. the number of avalanche fatalities per year
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
A carton contains 12 eggs. 3 of the eggs are cracked and 1 egg is a bad discolored one. What is the probability of randomly selecting a cracked egg? What is the probability of randomly selecting a good egg? What is the probability of randomly selecti..
If these two assumptions are correct, then what is the probability that the sample mean waiting time,T, based on your random sample of size n=36, will exceed 104 hours?
Scores are normally distributed with an average of 1500 and a standard deviation of 150 The minimum exam score necessary for applicants to be further considered for admission is?
why is the repeated measures anova usually a more sensitive test of the relationship between the independent and
If 60% of Americans are right handed and 40% are left handed. If we randomly pick 15 Americans what is the probablity that all 15 are right handed?
the probability density function of the time required to complete an assembly operation is for seconds.a determine the
Before starting the trial, a pilot study is conducted involving 7 participants. Is there a statistically significant difference in blood pressures overtime? Run the test at a 5% level of significance.
In forestry there appears to be a correlation between the diameter of a tree at breast height and the totol height of the tree. For the following sample of ten white spruces first construct a scatter plot then find the correlation (r) between heig..
Time to help a stranger was investigated by a group of undergraduate psychology majors as a part of their Introduction to Research Methods course.
Machine X test unit cost $3000 with beta=3 and theta=500, Machine Y test unit cost $2000 with beta=3 and theta=400. If the machines oil fixtures has life of 20 hrs, which machine goes to market first?
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